tantum…quantum = as much as, as far as
Tantum prodire volandōquantum aciē possent oculi servare = They advanced as far as eyes might be able to keep them in sight.
tantus(a, um)…quantus(a, um) = as great as
Tantus erat amor Didonis quantus amor Aeneae erat = The love of Dido was as great as the love of Aeneas was.
tam…quam = as (adjective) as
Priamus est tam vetus quam Anchises = Priam is as old as Anchises.
tot…quot = as many as
Habebo tot canēs quot servōs = I will have as many dogs as slaves.